MERGE INTO table_name（目的表） table_alias USING (table/view/sub_query)//数据来源（可以用子查询）alias(别名) on(连接条件) WHEN MATCHED THEN UPDATE SET(关键字) (修改目的表) 目的表AL.col1=原表AL.col_var1 目的表AL.col2=原表AL.col2_var2 WHEN NOT MATCHEN THEN（关键字） INSERT (目的表AL.COL_LIST) VALUES(原表AL.COL_VARS);（插入原表）

MERGE INTO products p USING newproducts np ON (p.product_id = np.product_id) WHEN MATCHED THEN UPDATE SET p.product_name = np.product_name,p.category = np.category WHERE np.category = 'BOOKS' WHEN NOT MATCHED THEN INSERT VALUES (np.product_id,np.product_name,np.category) WHERE np.category = 'BOOKS'